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Stockholders' Equity - Tax Effects Related to the Change in Each Component of Other Comprehensive Income (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Equity [Abstract]    
Unrealized gains (losses) on available-for-sale securities, Before-Tax Amount $ 2,656 $ 1,244
Unrealized gains (losses) on available-for-sale securities, Tax (Expense) Benefit (1,036) (486)
Unrealized gains (losses) on available-for-sale securities, Net-of-Tax Amount 1,620 758
Unrealized gains (losses) on cash flow hedges, Before-Tax Amount 79  
Unrealized gains (losses) on cash flow hedges, Net-of-Tax Amount 79  
Reclassification adjustment for amounts related to available-for-sale investments included in net income, Before-Tax Amount (469) (1,661)
Reclassification adjustment for amounts related to available-for-sale investments included in net income, Tax (Expense) Benefit 184 648
Reclassification adjustment for amounts related to available-for-sale investments included in net income, Net-of-Tax Amount (285) (1,013)
Reclassification adjustment for amounts related to defined benefit plan adjustments included in net income, Before-Tax Amount 80 65
Reclassification adjustment for amounts related to defined benefit plan adjustments included in net income, Tax (Expense) Benefit (25) (20)
Reclassification adjustment for amounts related to defined benefit plan adjustments included in net income, Net-of-Tax Amount 55 45
Foreign currency translation adjustment, Before-Tax Amount 1,242 1,228
Foreign currency translation adjustment, Net-of-Tax Amount 1,242 1,228
Total Other Comprehensive Income (Loss), Before-Tax Amount 3,588 876
Total Other Comprehensive Income (Loss), Tax (Expense) Benefit (877) 142
Other Comprehensive Income, net of tax $ 2,711 $ 1,018